/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *    https://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */
package org.grails.cli.interactive.completers

import groovy.transform.CompileStatic

import jline.console.completer.Completer

/**
 * @author Graeme Rocher
 * @since 3.0
 */
@CompileStatic
class ClosureCompleter implements Completer {

    private Closure<Collection<String>> closure
    private Completer completer

    ClosureCompleter(Closure<Collection<String>> closure) {
        this.closure = closure
    }

    Completer getCompleter() {
        if (completer == null) {
            completer = new jline.console.completer.StringsCompleter(closure.call())
        }
        completer
    }

    @Override
    int complete(String buffer, int cursor, List<CharSequence> candidates) {
        getCompleter().complete(buffer, cursor, candidates)
    }
}
